Is it just me, or are the recent visual overhauls of EBay, Microsoft, and Google remarkably similar?

  - The logos all have red, blue, yellow, green (that was
    true before, but the shades they use seem more
    similar now)
  - flat styling with minimal drop shadows
  - using lots of white background and light grey lines/panels
  - more hard square corners than rounded
  - san serif fonts (very similar if not identical)
  - hovering over links underlines
  - full width backgrounds

I'm not a designer, but it just seems like a very common visual vocabulary. I wonder why the brands wouldn't try to differentiate themselves more? It has some similarities to Apple's aesthetic but less "sleek" with the multi-colors.

They're going for "clean" but to me it's starting to look a little bland.